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: diff.py

# diff.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php

import re
from git.cmd import handle_process_output
from git.compat import defenc
from git.util import finalize_process, hex_to_bin

from .objects.blob import Blob
from .objects.util import mode_str_to_int

# typing ------------------------------------------------------------------

from typing import (
    Any,
    Iterator,
    List,
    Match,
    Optional,
    Tuple,
    Type,
    TypeVar,
    Union,
    TYPE_CHECKING,
    cast,
)
from git.types import PathLike, Literal

if TYPE_CHECKING:
    from .objects.tree import Tree
    from .objects import Commit
    from git.repo.base import Repo
    from git.objects.base import IndexObject
    from subprocess import Popen
    from git import Git

Lit_change_type = Literal["A", "D", "C", "M", "R", "T", "U"]

# def is_change_type(inp: str) -> TypeGuard[Lit_change_type]:
#     # return True
#     return inp in ['A', 'D', 'C', 'M', 'R', 'T', 'U']

# ------------------------------------------------------------------------

__all__ = ("Diffable", "DiffIndex", "Diff", "NULL_TREE")

# Special object to compare against the empty tree in diffs
NULL_TREE = object()

_octal_byte_re = re.compile(b"\\\\([0-9]{3})")

def _octal_repl(matchobj: Match) -> bytes:
    value = matchobj.group(1)
    value = int(value, 8)
    value = bytes(bytearray((value,)))
    return value

def decode_path(path: bytes, has_ab_prefix: bool = True) -> Optional[bytes]:
    if path == b"/dev/null":
        return None

if path.startswith(b'"') and path.endswith(b'"'):
        path = path[1:-1].replace(b"\\n", b"\n").replace(b"\\t", b"\t").replace(b'\\"', b'"').replace(b"\\\\", b"\\")

path = _octal_byte_re.sub(_octal_repl, path)

if has_ab_prefix:
        assert path.startswith(b"a/") or path.startswith(b"b/")
        path = path[2:]

return path

class Diffable(object):

"""Common interface for all object that can be diffed against another object of compatible type.

:note:
        Subclasses require a repo member as it is the case for Object instances, for practical
        reasons we do not derive from Object."""

__slots__ = ()

# standin indicating you want to diff against the index
    class Index(object):
        pass

def _process_diff_args(
        self, args: List[Union[str, "Diffable", Type["Diffable.Index"], object]]
    ) -> List[Union[str, "Diffable", Type["Diffable.Index"], object]]:
        """
        :return:
            possibly altered version of the given args list.
            Method is called right before git command execution.
            Subclasses can use it to alter the behaviour of the superclass"""
        return args

def diff(
        self,
        other: Union[Type["Index"], "Tree", "Commit", None, str, object] = Index,
        paths: Union[PathLike, List[PathLike], Tuple[PathLike, ...], None] = None,
        create_patch: bool = False,
        **kwargs: Any,
    ) -> "DiffIndex":
        """Creates diffs between two items being trees, trees and index or an
        index and the working tree. It will detect renames automatically.

:param other:
            Is the item to compare us with.
            If None, we will be compared to the working tree.
            If Treeish, it will be compared against the respective tree
            If Index ( type ), it will be compared against the index.
            If git.NULL_TREE, it will compare against the empty tree.
            It defaults to Index to assure the method will not by-default fail
            on bare repositories.

:param paths:
            is a list of paths or a single path to limit the diff to.
            It will only include at least one of the given path or paths.

:param create_patch:
            If True, the returned Diff contains a detailed patch that if applied
            makes the self to other. Patches are somewhat costly as blobs have to be read
            and diffed.

:param kwargs:
            Additional arguments passed to git-diff, such as
            R=True to swap both sides of the diff.

:return: git.DiffIndex

:note:
            On a bare repository, 'other' needs to be provided as Index or as
            as Tree/Commit, or a git command error will occur"""
        args: List[Union[PathLike, Diffable, Type["Diffable.Index"], object]] = []
        args.append("--abbrev=40")  # we need full shas
        args.append("--full-index")  # get full index paths, not only filenames

# remove default '-M' arg (check for renames) if user is overriding it
        if not any(x in kwargs for x in ('find_renames', 'no_renames', 'M')):
            args.append("-M")

if create_patch:
            args.append("-p")
        else:
            args.append("--raw")
            args.append("-z")

# in any way, assure we don't see colored output,
        # fixes https://github.com/gitpython-developers/GitPython/issues/172
        args.append("--no-color")

if paths is not None and not isinstance(paths, (tuple, list)):
            paths = [paths]

if hasattr(self, "Has_Repo"):
            self.repo: "Repo" = self.repo

diff_cmd = self.repo.git.diff
        if other is self.Index:
            args.insert(0, "--cached")
        elif other is NULL_TREE:
            args.insert(0, "-r")  # recursive diff-tree
            args.insert(0, "--root")
            diff_cmd = self.repo.git.diff_tree
        elif other is not None:
            args.insert(0, "-r")  # recursive diff-tree
            args.insert(0, other)
            diff_cmd = self.repo.git.diff_tree

args.insert(0, self)

# paths is list here or None
        if paths:
            args.append("--")
            args.extend(paths)
        # END paths handling

kwargs["as_process"] = True
        proc = diff_cmd(*self._process_diff_args(args), **kwargs)

diff_method = Diff._index_from_patch_format if create_patch else Diff._index_from_raw_format
        index = diff_method(self.repo, proc)

proc.wait()
        return index

T_Diff = TypeVar("T_Diff", bound="Diff")

class DiffIndex(List[T_Diff]):

"""Implements an Index for diffs, allowing a list of Diffs to be queried by
    the diff properties.

The class improves the diff handling convenience"""

# change type invariant identifying possible ways a blob can have changed
    # A = Added
    # D = Deleted
    # R = Renamed
    # M = Modified
    # T = Changed in the type
    change_type = ("A", "C", "D", "R", "M", "T")

def iter_change_type(self, change_type: Lit_change_type) -> Iterator[T_Diff]:
        """
        :return:
            iterator yielding Diff instances that match the given change_type

:param change_type:
            Member of DiffIndex.change_type, namely:

* 'A' for added paths
            * 'D' for deleted paths
            * 'R' for renamed paths
            * 'M' for paths with modified data
            * 'T' for changed in the type paths
        """
        if change_type not in self.change_type:
            raise ValueError("Invalid change type: %s" % change_type)

for diffidx in self:
            if diffidx.change_type == change_type:
                yield diffidx
            elif change_type == "A" and diffidx.new_file:
                yield diffidx
            elif change_type == "D" and diffidx.deleted_file:
                yield diffidx
            elif change_type == "C" and diffidx.copied_file:
                yield diffidx
            elif change_type == "R" and diffidx.renamed:
                yield diffidx
            elif change_type == "M" and diffidx.a_blob and diffidx.b_blob and diffidx.a_blob != diffidx.b_blob:
                yield diffidx
        # END for each diff

class Diff(object):

"""A Diff contains diff information between two Trees.

It contains two sides a and b of the diff, members are prefixed with
    "a" and "b" respectively to inidcate that.

Diffs keep information about the changed blob objects, the file mode, renames,
    deletions and new files.

There are a few cases where None has to be expected as member variable value:

``New File``::

a_mode is None
        a_blob is None
        a_path is None

``Deleted File``::

b_mode is None
        b_blob is None
        b_path is None

``Working Tree Blobs``

When comparing to working trees, the working tree blob will have a null hexsha
        as a corresponding object does not yet exist. The mode will be null as well.
        But the path will be available though.
        If it is listed in a diff the working tree version of the file must
        be different to the version in the index or tree, and hence has been modified."""

# precompiled regex
    re_header = re.compile(
        rb"""
                                ^diff[ ]--git
                                    [ ](?P<a_path_fallback>"?[ab]/.+?"?)[ ](?P<b_path_fallback>"?[ab]/.+?"?)\n
                                (?:^old[ ]mode[ ](?P<old_mode>\d+)\n
                                   ^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
                                (?:^similarity[ ]index[ ]\d+%\n
                                   ^rename[ ]from[ ](?P<rename_from>.*)\n
                                   ^rename[ ]to[ ](?P<rename_to>.*)(?:\n|$))?
                                (?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
                                (?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
                                (?:^similarity[ ]index[ ]\d+%\n
                                   ^copy[ ]from[ ].*\n
                                   ^copy[ ]to[ ](?P<copied_file_name>.*)(?:\n|$))?
                                (?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
                                    \.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
                                (?:^---[ ](?P<a_path>[^\t\n\r\f\v]*)[\t\r\f\v]*(?:\n|$))?
                                (?:^\+\+\+[ ](?P<b_path>[^\t\n\r\f\v]*)[\t\r\f\v]*(?:\n|$))?
                            """,
        re.VERBOSE | re.MULTILINE,
    )
    # can be used for comparisons
    NULL_HEX_SHA = "0" * 40
    NULL_BIN_SHA = b"\0" * 20

__slots__ = (
        "a_blob",
        "b_blob",
        "a_mode",
        "b_mode",
        "a_rawpath",
        "b_rawpath",
        "new_file",
        "deleted_file",
        "copied_file",
        "raw_rename_from",
        "raw_rename_to",
        "diff",
        "change_type",
        "score",
    )

def __init__(
        self,
        repo: "Repo",
        a_rawpath: Optional[bytes],
        b_rawpath: Optional[bytes],
        a_blob_id: Union[str, bytes, None],
        b_blob_id: Union[str, bytes, None],
        a_mode: Union[bytes, str, None],
        b_mode: Union[bytes, str, None],
        new_file: bool,
        deleted_file: bool,
        copied_file: bool,
        raw_rename_from: Optional[bytes],
        raw_rename_to: Optional[bytes],
        diff: Union[str, bytes, None],
        change_type: Optional[Lit_change_type],
        score: Optional[int],
    ) -> None:

assert a_rawpath is None or isinstance(a_rawpath, bytes)
        assert b_rawpath is None or isinstance(b_rawpath, bytes)
        self.a_rawpath = a_rawpath
        self.b_rawpath = b_rawpath

self.a_mode = mode_str_to_int(a_mode) if a_mode else None
        self.b_mode = mode_str_to_int(b_mode) if b_mode else None

# Determine whether this diff references a submodule, if it does then
        # we need to overwrite "repo" to the corresponding submodule's repo instead
        if repo and a_rawpath:
            for submodule in repo.submodules:
                if submodule.path == a_rawpath.decode(defenc, "replace"):
                    if submodule.module_exists():
                        repo = submodule.module()
                    break

self.a_blob: Union["IndexObject", None]
        if a_blob_id is None or a_blob_id == self.NULL_HEX_SHA:
            self.a_blob = None
        else:
            self.a_blob = Blob(repo, hex_to_bin(a_blob_id), mode=self.a_mode, path=self.a_path)

self.b_blob: Union["IndexObject", None]
        if b_blob_id is None or b_blob_id == self.NULL_HEX_SHA:
            self.b_blob = None
        else:
            self.b_blob = Blob(repo, hex_to_bin(b_blob_id), mode=self.b_mode, path=self.b_path)

self.new_file: bool = new_file
        self.deleted_file: bool = deleted_file
        self.copied_file: bool = copied_file

# be clear and use None instead of empty strings
        assert raw_rename_from is None or isinstance(raw_rename_from, bytes)
        assert raw_rename_to is None or isinstance(raw_rename_to, bytes)
        self.raw_rename_from = raw_rename_from or None
        self.raw_rename_to = raw_rename_to or None

self.diff = diff
        self.change_type: Union[Lit_change_type, None] = change_type
        self.score = score

def __eq__(self, other: object) -> bool:
        for name in self.__slots__:
            if getattr(self, name) != getattr(other, name):
                return False
        # END for each name
        return True

def __ne__(self, other: object) -> bool:
        return not (self == other)

def __hash__(self) -> int:
        return hash(tuple(getattr(self, n) for n in self.__slots__))

def __str__(self) -> str:
        h: str = "%s"
        if self.a_blob:
            h %= self.a_blob.path
        elif self.b_blob:
            h %= self.b_blob.path

msg: str = ""
        line = None  # temp line
        line_length = 0  # line length
        for b, n in zip((self.a_blob, self.b_blob), ("lhs", "rhs")):
            if b:
                line = "\n%s: %o | %s" % (n, b.mode, b.hexsha)
            else:
                line = "\n%s: None" % n
            # END if blob is not None
            line_length = max(len(line), line_length)
            msg += line
        # END for each blob

# add headline
        h += "\n" + "=" * line_length

if self.deleted_file:
            msg += "\nfile deleted in rhs"
        if self.new_file:
            msg += "\nfile added in rhs"
        if self.copied_file:
            msg += "\nfile %r copied from %r" % (self.b_path, self.a_path)
        if self.rename_from:
            msg += "\nfile renamed from %r" % self.rename_from
        if self.rename_to:
            msg += "\nfile renamed to %r" % self.rename_to
        if self.diff:
            msg += "\n---"
            try:
                msg += self.diff.decode(defenc) if isinstance(self.diff, bytes) else self.diff
            except UnicodeDecodeError:
                msg += "OMITTED BINARY DATA"
            # end handle encoding
            msg += "\n---"
        # END diff info

# Python2 silliness: have to assure we convert our likely to be unicode object to a string with the
        # right encoding. Otherwise it tries to convert it using ascii, which may fail ungracefully
        res = h + msg
        # end
        return res

@property
    def a_path(self) -> Optional[str]:
        return self.a_rawpath.decode(defenc, "replace") if self.a_rawpath else None

@property
    def b_path(self) -> Optional[str]:
        return self.b_rawpath.decode(defenc, "replace") if self.b_rawpath else None

@property
    def rename_from(self) -> Optional[str]:
        return self.raw_rename_from.decode(defenc, "replace") if self.raw_rename_from else None

@property
    def rename_to(self) -> Optional[str]:
        return self.raw_rename_to.decode(defenc, "replace") if self.raw_rename_to else None

@property
    def renamed(self) -> bool:
        """:returns: True if the blob of our diff has been renamed
        :note: This property is deprecated, please use ``renamed_file`` instead.
        """
        return self.renamed_file

@property
    def renamed_file(self) -> bool:
        """:returns: True if the blob of our diff has been renamed"""
        return self.rename_from != self.rename_to

@classmethod
    def _pick_best_path(cls, path_match: bytes, rename_match: bytes, path_fallback_match: bytes) -> Optional[bytes]:
        if path_match:
            return decode_path(path_match)

if rename_match:
            return decode_path(rename_match, has_ab_prefix=False)

if path_fallback_match:
            return decode_path(path_fallback_match)

return None

@classmethod
    def _index_from_patch_format(cls, repo: "Repo", proc: Union["Popen", "Git.AutoInterrupt"]) -> DiffIndex:
        """Create a new DiffIndex from the given text which must be in patch format
        :param repo: is the repository we are operating on - it is required
        :param stream: result of 'git diff' as a stream (supporting file protocol)
        :return: git.DiffIndex"""

## FIXME: Here SLURPING raw, need to re-phrase header-regexes linewise.
        text_list: List[bytes] = []
        handle_process_output(proc, text_list.append, None, finalize_process, decode_streams=False)

# for now, we have to bake the stream
        text = b"".join(text_list)
        index: "DiffIndex" = DiffIndex()
        previous_header: Union[Match[bytes], None] = None
        header: Union[Match[bytes], None] = None
        a_path, b_path = None, None  # for mypy
        a_mode, b_mode = None, None  # for mypy
        for _header in cls.re_header.finditer(text):
            (
                a_path_fallback,
                b_path_fallback,
                old_mode,
                new_mode,
                rename_from,
                rename_to,
                new_file_mode,
                deleted_file_mode,
                copied_file_name,
                a_blob_id,
                b_blob_id,
                b_mode,
                a_path,
                b_path,
            ) = _header.groups()

new_file, deleted_file, copied_file = (
                bool(new_file_mode),
                bool(deleted_file_mode),
                bool(copied_file_name),
            )

a_path = cls._pick_best_path(a_path, rename_from, a_path_fallback)
            b_path = cls._pick_best_path(b_path, rename_to, b_path_fallback)

# Our only means to find the actual text is to see what has not been matched by our regex,
            # and then retro-actively assign it to our index
            if previous_header is not None:
                index[-1].diff = text[previous_header.end() : _header.start()]
            # end assign actual diff

# Make sure the mode is set if the path is set. Otherwise the resulting blob is invalid
            # We just use the one mode we should have parsed
            a_mode = old_mode or deleted_file_mode or (a_path and (b_mode or new_mode or new_file_mode))
            b_mode = b_mode or new_mode or new_file_mode or (b_path and a_mode)
            index.append(
                Diff(
                    repo,
                    a_path,
                    b_path,
                    a_blob_id and a_blob_id.decode(defenc),
                    b_blob_id and b_blob_id.decode(defenc),
                    a_mode and a_mode.decode(defenc),
                    b_mode and b_mode.decode(defenc),
                    new_file,
                    deleted_file,
                    copied_file,
                    rename_from,
                    rename_to,
                    None,
                    None,
                    None,
                )
            )

previous_header = _header
            header = _header
        # end for each header we parse
        if index and header:
            index[-1].diff = text[header.end() :]
        # end assign last diff

return index

@staticmethod
    def _handle_diff_line(lines_bytes: bytes, repo: "Repo", index: DiffIndex) -> None:
        lines = lines_bytes.decode(defenc)

# Discard everything before the first colon, and the colon itself.
        _, _, lines = lines.partition(":")

for line in lines.split("\x00:"):
            if not line:
                # The line data is empty, skip
                continue
            meta, _, path = line.partition("\x00")
            path = path.rstrip("\x00")
            a_blob_id: Optional[str]
            b_blob_id: Optional[str]
            old_mode, new_mode, a_blob_id, b_blob_id, _change_type = meta.split(None, 4)
            # Change type can be R100
            # R: status letter
            # 100: score (in case of copy and rename)
            # assert is_change_type(_change_type[0]), f"Unexpected value for change_type received: {_change_type[0]}"
            change_type: Lit_change_type = cast(Lit_change_type, _change_type[0])
            score_str = "".join(_change_type[1:])
            score = int(score_str) if score_str.isdigit() else None
            path = path.strip()
            a_path = path.encode(defenc)
            b_path = path.encode(defenc)
            deleted_file = False
            new_file = False
            copied_file = False
            rename_from = None
            rename_to = None

# NOTE: We cannot conclude from the existence of a blob to change type
            # as diffs with the working do not have blobs yet
            if change_type == "D":
                b_blob_id = None  # Optional[str]
                deleted_file = True
            elif change_type == "A":
                a_blob_id = None
                new_file = True
            elif change_type == "C":
                copied_file = True
                a_path_str, b_path_str = path.split("\x00", 1)
                a_path = a_path_str.encode(defenc)
                b_path = b_path_str.encode(defenc)
            elif change_type == "R":
                a_path_str, b_path_str = path.split("\x00", 1)
                a_path = a_path_str.encode(defenc)
                b_path = b_path_str.encode(defenc)
                rename_from, rename_to = a_path, b_path
            elif change_type == "T":
                # Nothing to do
                pass
            # END add/remove handling

diff = Diff(
                repo,
                a_path,
                b_path,
                a_blob_id,
                b_blob_id,
                old_mode,
                new_mode,
                new_file,
                deleted_file,
                copied_file,
                rename_from,
                rename_to,
                "",
                change_type,
                score,
            )
            index.append(diff)

@classmethod
    def _index_from_raw_format(cls, repo: "Repo", proc: "Popen") -> "DiffIndex":
        """Create a new DiffIndex from the given stream which must be in raw format.
        :return: git.DiffIndex"""
        # handles
        # :100644 100644 687099101... 37c5e30c8... M    .gitignore

index: "DiffIndex" = DiffIndex()
        handle_process_output(
            proc,
            lambda byt: cls._handle_diff_line(byt, repo, index),
            None,
            finalize_process,
            decode_streams=False,
        )

return index

Name	Type	Last Edit	Size	Owner/Group	Permission	Action
..
__init__.py	file	2026-01-20 13:01	2.29 KB	root/root	s---------
cmd.py	file	2026-01-20 13:01	52.45 KB	root/root	s---------
compat.py	file	2026-01-20 13:01	2.2 KB	root/root	s---------
config.py	file	2026-01-20 13:01	33.77 KB	root/root	s---------
db.py	file	2026-01-20 13:01	2.19 KB	root/root	s---------
diff.py	file	2026-01-20 13:01	22.88 KB	root/root	s---------
exc.py	file	2026-01-20 13:01	6.29 KB	root/root	s---------
py.typed	file	2026-01-20 13:01	0 B	root/root	s---------
remote.py	file	2026-01-20 13:01	44.01 KB	root/root	s---------
types.py	file	2026-01-20 13:01	2.95 KB	root/root	s---------
util.py	file	2026-01-20 13:01	38.94 KB	root/root	s---------